Power hammer



Sept. 20, 1927, 642859 W. KIRCHNER POWER HAMMER Filed Mayl2. 1924 2 Sheets-Sheet 2 Patented Sept. 20, 1927.

UNITED STATES WILLIAM KIBCHINER, OF SPARTA. n.r1sborrsnv'- v POWER HAMMER.

Application filed May 12,

This 'i11vention relates t a powerhammer, one of the objects being to provicle a hammer which can be adjustecl angularly to strike blows in any direction desired, thus adopting the device particularly to machine shop work Where it is clesireol to rivet, weld and hammer out metal loca.ted ab diflerent angles relative to the base of the hammer.

A further object is to provide a structure of this character Which is simple, durable and compact ancl can be operated reaclily.

VVith the foregoing and. other objects in view which will appear as the clescription proceeds, the invention resicles in the 00mbination and arrangementv of parts and in the details of construction hereinafter de scribed and claimed, it being unclerstood that changes in the precise embodiment of the invention hereinafter describecl and cla.imed may be made within ehe scope 01' what is claimed withoutdeparting from the spirit 01 the invention.

In the accompanying drawings the preferred form of tl1e invention has been shown.

' In said drawings Figure 1 is a front elevation of the power hammer, one of the positions t0 which the same can be adjusted being indicatedhy 30 broken lines.

Fig. 2 is a view partly in 'Sl0l elevation and partly in section of the power hammer. Fig. 3 is a top plan view. Fig. 4 is a section on line 4-4, Fig. 2.

Referring to the figures by characters 01 reference 1 designates a base provided with a pedestal 2 and preferably with an anvil 3. A tubular shank 4 is mounted for rotation in the pedestal and extends from a tiltable arm 5 adapted to be adjustecl to any desired angle relative t0 the base about the axis of the shank 4. Any suitable means may be employed f'or hololing tl1e shank against rotation in. the pe-clesal ancl in the drawings a set screw 6 has been illustrated for this purpose. Obviously any other means may be employed if desired. Furthermore, and as shown in Figs. 2 anal 4, suitable grease 01 011 cups 7 may be providecl on the pedestal f01 directing a lubricant into grooves 8 provided in the shank 4 and from which are extended openings 9. These openings are adapted to feed lubricants to a shaft 10 journaled in t he shank 4 and 5 provided at one end with a pulley 11 block 21 and is connected by oppositelv 1924. Sma1 1{0. 712/776.

adapted to be driven by a belt 01' any other means.

The arm 5 is provided, near its lower end, with guicle cleats 12 between which is mounted a clove-tail 13 carried by a slidable head '14. The lovver end 01 this head has an extension 15 constituting a hemmen The guides 12 not only serve to hold the head 14 movably assembled with the arm 5 but also serve to hold the dove-tail 13 spaced from the face of the arm 5. Thus there is room between the arm 5 and the dove-tail 13 f'or the mo-vement 0f a wrist pin 16 extencling from a crank or disk 17. This crank 01 disk is rotatably mounted with a 7 recess 18 in arm 5 and is secured to the shaft 10. y

Spaced guide cleats 20 are Provided on' the arm 5 near the upper end thereof and are. slidably engaged by a block 21 to which is pivotally connected the'upper end of a pitman 22. The lower end of this pitman engages the wrist pin 16.

A stucl 23 is extended outwardly from the bovvecl spring arms 24 to oppositely exten ing arms 25 fixed relative to the top Portion of the head 14.-

It will be obvious from the foregoing thatwhen the shaft 19 is rotated motion will be transmitted therefrom through the wristin 16 and pitman 22 to the blocks 21 whmh Will thus loe caused t0 reciprocate upon the guides 20. This reciprocation motion Will be transmitted through the spring arm 24 and the rigid arms 25 to the head 14. Thus the hammer 15 can be driven against the anvll 3 01 an object thereon, the spring arms 24 permitting it to rebound. By loosening the clamping means 6 the arm 5 can be adjusted angularly so that the hammer 15 can reciprocate along lines of any desired angles relative to base 1. Thus work located atthe side of the power hammer can be struck a bl0w ab any angle desired by plaeing it sufi1ciently close to receive the impact from the hammer 15. It is merely essential that, alter the arm 5 has been adjusted t0 the proper angle, it be securely held by the clamping means 6. A suitable motor can be 105 utilized for driving the shaft 19 and it has been found in racice that, by means of a, device such as erein described, very rapid powerful blows can be struck. Thus the apparatus is especially useful in machine shops for forging and f0r riveting and is also advanbageous;as a means=for=drawing out-drills such as used in drilling 011 wells.

What is claimed is In a powerhammerthe combination with a supporting structure, an -anvi1 fixed relative thereto, an arm mounted to swinggela: tive t0 the structure, and a crank mounted for rotation relative t0 vthe sup-porting struct-ure, said arm being mounted to swing about theaxisofrotati0n of=the crank, of a bannmer head m ounted for reciprocationonehe arm, the axis of rotation of the crank extendin-g at all times"substantially:through the center-ofmass of the headwhen the head is in any osition, a block mounted f0r reciprocaoion. upgn 0ne encl ortion of the arm, means operated by the stank 13'01 recip1aocating be block, and resilient driving connections between the block anc1 the hammer head;

In testimony that I claim the foregoing as WILLIAM KIRC'HNER 

